#! /bin/bash

set -eux

source .github/scripts/host.sh

if [ -f $HOME/.local/lib/libff"$EXT" ]; then
  echo "libff exists, exiting..."
  exit 0
fi

if [ -d libff ]; then
  echo "$(pwd)/libff" already exists! Using it instead of re-cloning the repo.
else
  git clone https://github.com/scipr-lab/libff -b v0.2.1 --recursive
fi
cd libff
git checkout v0.2.1
git submodule init && git submodule update

# Fix libff header installation with CMake >= 4.3
# CMake 4.3 commit 4e7e6928cb ("install: Fix bugs around empty
#  directories") changed the behavior of install(DIRECTORY "" ...).
# Previously, an empty string was silently expanded to the current source
# directory. CMake 4.3 now treats it as a no-op that creates the
# destination directory but installs nothing into it.
# Replace the empty string with "./" to explicitly reference the current
# source directory, restoring header installation. The trailing slash
# ensures the directory *contents* are installed rather than the directory
# itself.
# See: https://gitlab.kitware.com/cmake/cmake/-/issues/27568
if [ "$HOST_OS" = "macOS" ]; then
  sed -i '' 's#DIRECTORY "" DESTINATION "include/libff"#DIRECTORY "./" DESTINATION "include/libff"#' libff/CMakeLists.txt
else
  sed -i 's#DIRECTORY "" DESTINATION "include/libff"#DIRECTORY "./" DESTINATION "include/libff"#' libff/CMakeLists.txt
fi

ARGS=("-DCMAKE_INSTALL_PREFIX=$PREFIX" "-DWITH_PROCPS=OFF" "-DCMAKE_POLICY_VERSION_MINIMUM=3.5" "-DCMAKE_CXX_STANDARD=11")
CXXFLAGS=""
if [ "$HOST_OS" = "macOS" ]; then
  OPENSSL_PREFIX=$(brew --prefix openssl)
  export LDFLAGS=-L$OPENSSL_PREFIX/lib
  export CPPFLAGS=-I$OPENSSL_PREFIX/include
  export CXXFLAGS=-I$OPENSSL_PREFIX/include
  ARGS+=("-DOPENSSL_INCLUDE_DIR=$OPENSSL_PREFIX/include/openssl" "-DCURVE=ALT_BN128" "-DCMAKE_INSTALL_NAME_DIR=$PREFIX/lib" "-DOPENSSL_CRYPTO_LIBRARY=$OPENSSL_PREFIX/lib/libcrypto.dylib" "-DOPENSSL_SSL_LIBRARY=$OPENSSL_PREFIX/lib/libssl.dylib")
  sed -i '' 's/STATIC/SHARED/' libff/CMakeLists.txt # Fix GHC segfaults from hell (idk why)
  sed -i '' 's/STATIC/SHARED/' depends/CMakeLists.txt
fi

if [ "$HOST_OS" = "Linux" ] && [ "$(uname -m)" = "aarch64" ]; then
  ARGS+=("-DCURVE=ALT_BN128")
fi

if [ "$HOST_OS" = "Windows" ]; then
  ARGS+=("-G" "Ninja" "-DCMAKE_TOOLCHAIN_FILE=$PWD/../.github/scripts/windows-ghc-toolchain.cmake")
  sed -i 's/find_library(GMP_LIBRARY gmp)/find_library(GMP_LIBRARY NAMES libgmp.a)/' CMakeLists.txt

  # This ends up causing the system headers to be included with -I and
  # thus they override the GHC mingw compiler ones. So this removes it
  # and re-adds the include with idirafter via the toolchain file
  sed -i '/INCLUDE_DIRECTORIES.*OPENSSL_INCLUDE_DIR/d' CMakeLists.txt

  # Apply windows-specific libff patch carried by hevm
  curl -fsSL https://raw.githubusercontent.com/argotorg/hevm/1abe4c79eeada928acc279b631c48eeb2a1376c2/.github/scripts/libff.patch | patch -p1
fi

mkdir -p build
cd build
CXXFLAGS="-fPIC $CXXFLAGS" cmake "${ARGS[@]}" ..
cmake --build . && cmake --install .